Leakage Resilient IBE and IPE under the DLIN Assumption

Abstract

In this paper, we show identity-based encryption (IBE) and inner product encryption (IPE) schemes which achieve the maximum-possible leakage rate 1 − o(1). These schemes are secure under the decision linear (DLIN) assumption in the standard model. Specifically, even if 1 − o(1) fraction of each private key is arbitrarily leaked, the IBE scheme is fully secure and the IPE scheme is selectively secure.